Fix bug that connection drop signal related funtion throw a bad_weak …#1940

Merged

dirk-thomas merged 3 commits intoros:noetic-develfrom Barry-Xu-2018:topic-noetic-fix-bad-weak-ptr

May 15, 2020

+12-4

Commits on Apr 27, 2020

Fix bug that connection drop signal related funtion throw a bad_weak exception
Barry-Xu-2018
committed

Commits on Apr 28, 2020

Fix dead lock about call_queue_mutex_ and drop_mutex_ in two threads
Barry-Xu-2018
committed

Commits on May 15, 2020

Remove check that is not necessary
Barry-Xu-2018
committed